I'm also using FireFox, for the luls i also tried with Internet Explorer and obviously if fails too.
For example this link is broken :
http://www.thehelper.net/forums/showthread.php?t=144420&page=2
This is the page 2 of this thread :
http://www.thehelper.net/forums/showthread.php?t=144420
But as you can see the first page works fine, and "post reply" or "quote" doesn't work as well.